Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
Current assets:
Allowances for returns and doubtful accounts	$ 351,221	$ 338,245
Stockholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	600,000,000	600,000,000
Common stock, shares issued	267,137,701	262,542,659
Common stock, shares outstanding	230,795,299	235,394,281
Treasury stock, shares held	36,342,402	27,148,378